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Where is my account page? - Word - Office.com
Your account page is on Office.com. After you sign in, click the arrow next to your name, and then click My Account.
Cancel your Office 365 Home Premium Subscription - Support - Office.com
You can cancel your Office 365 Home Premium subscription on your account page.
Manage Microsoft Office billing options
Provides information about managing payment options like adding, editing or removing credit card or PayPal information, managing and cancelling subscriptions, pre-paid codes, and getting refunds.